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N-15 isotope fractionation in an aquatic food chain: Bellamya aeruginosa (Reeve) as an algal control agent

文献类型： 外文期刊

作者： Han, Shiqun 1 ; Yan, Shaohua 1 ; Chen, Kaining 2 ; Zhang, Zhenhua 3 ; Zed, Rengel 3 ; Zhang, Jianqiu 1 ; Song, Wei 1 ; Li 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

2.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210014, Peoples R China

3.Univ Western Australia, Sch Earth & Environm, Crawley, WA 6009, Australia

关键词： N-15 fractionation;algal bloom;Bellamya aeruginosa;ecological modeling;eutrophication

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

ISSN： 1001-0742

年卷期： 2010 年 22 卷 2 期

页码：

收录情况： SCI

摘要： N-15 isotope tracer techniques and ecological modeling were adopted to investigate the fractionation of nitrogen, its uptake and transformation in algae and snail (Bellantya aeruginosa Reeve). Different algal species were found to differ in their uptake of nitrogen isotopes. Microcystis aeruginisa Mitz. demonstrated the greatest N-15 accumulation capacity, with the natural variation in isotopic ratio (delta N-15) and the isotope fractionation factor (epsilon, parts per thousand) being the highest among the species investigated. The transformation and utilization of N-15 by snails differed depending on the specific algae consumed (highest for Chlorella pyrenoidosa Chick., lowest for M. aeruginisa). When snails was seeded in the experimental pond, the algae population structure changed significantly, and total algal biomass as well as the concentration of all nitrogen species decreased, causing an increase in water transparency. A model, incorporating several chemical and biological parameters, was developed to predict algal biomass in an aquatic system when snails was present. The data collected during this investigation indicated that the gastropods such as snails could significantly impact biological community and water quality of small water bodies, suggesting a role for biological control of noxious algal blooms associated with eutrophication.

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